Titration Formulas With Conjugate Acids/Bases

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Jolie Sukonik 2B
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Joined: Wed Sep 30, 2020 9:44 pm

Titration Formulas With Conjugate Acids/Bases

Postby Jolie Sukonik 2B » Sat Dec 12, 2020 4:30 pm

Predict the pH (equal to 7, above 7, below 7) of this titration at the stoichiometric point: CH3CH2COOH titrated with Ba(OH)2

CH3CH2COOH is a weak acid so it will affect the pH of the solution. Ba(OH)2 is a metal oxide and a strong base so it won't affect the pH of the solution.

I know the conjugate acid of the weak base CH3CH2COOH is CH3CH2COO-. How do I find the conjugate acid of Ba(OH)2
CH3CH2COOH + Ba(OH)2 --> CH3CH2COO- + ?

I also know that the neutralization reaction produces an OH- with the salt, which makes the solution basic, pH > 7.
CH3CH2COO- + H2O <---> CH3CH2COOH + OH-
is this correctly written?

Stuti Pradhan 2J
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Joined: Wed Sep 30, 2020 9:32 pm
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Re: Titration Formulas With Conjugate Acids/Bases

Postby Stuti Pradhan 2J » Sat Dec 12, 2020 6:11 pm

I believe the conjugate acid would just be water in this situation, or 2 water molecules since the equation has (OH)2. Your second equation with the conjugate base of the weak acid is correct as that would be the reason as to why the pH increases to above 7.

Hope this helps!

Chinyere Okeke 2J
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Re: Titration Formulas With Conjugate Acids/Bases

Postby Chinyere Okeke 2J » Tue Dec 15, 2020 10:57 am

I think the conjugate acid would be water because the (OH) group of the Ba(OH)2 will be attracted to the H and form water!


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